Edexcel IGCSE Math A Foundation 1.7 C the Process of Proportionality to Evaluate Unknown Questions

Practise finding unit values, scale factors and missing quantities in cost, population, mixture and ratio contexts.

Exam points

find a unit amount before scaling to the required number of items
set up a multiplier or division when one population or quantity is a fraction of another
use ratio parts and the total volume to calculate a missing mixture quantity

[Maximum number: 2]

Jess makes salad dressing by mixing lemon juice and olive oil in the ratio 2: 5 by volume. She uses 0.5 litres of lemon juice.

Work out how much olive oil she uses to make the salad dressing.
litres

\frac{0.5}{2}\times5=1.25

Final answer:

1.25\text{ litres}

M1.

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